Math

Solve for x + 2y = 23 and - x + 4y = 31

Asked by AnneS2 on 18 Jun 05:09

Last updated by anonymous on 19 Jun 12:57

1 Answers

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Answered by CherieS on 19 Jun 12:57

x + 2y = 23

x + 2y-2y= 23-2y

x= 23-2y

- x + 4y = 31

- (23-2y) + 4y = 31

- (23) (-1)(-2y) + 4y = 31

-23+2y+ 4y = 31

-23+ 6y = 31

-23+ 6y+23 = 31+23

6y=54

6y/6=54/6

y=9

x= 23-2y

x= 23-2(9)

x= 23-18

x=15